Ocean Modeling Discussion

ROMS/TOMS

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PostPosted: Mon Apr 03, 2017 6:32 am 
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Joined: Mon Apr 16, 2012 2:18 pm
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Location: IR of Iran Meteorological Organization
Hello everybody
I run the ROMS model for PERSIAN Gulf and Oman Sea for 10 years and its results are in good acceptance with sattelite images and other model results. I used GRADIENT LBC for east boundary. but when I extend the domain to Indian Ocean, the model blow_up. it is a sample of SST contour. please help me to find proper LBC.


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PostPosted: Mon Apr 03, 2017 6:49 am 
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Joined: Wed Jul 02, 2003 5:29 pm
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Location: IMS/UAF, USA
For this sort of domain, I always use the RadNud option, providing values from a larger scale model at the open boundaries. If you are modeling recent years, you can download the HYCOM solutions and extract boundary files from them.


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PostPosted: Mon Apr 03, 2017 7:50 am 
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Thanks for your suggestion. I saw the HYCOM website. it has analysis and reanalysis data. each reanalysis data file for 3-hour interval is about 2.5 Gb. how can I get the necessary data from these files?


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PostPosted: Mon Apr 03, 2017 8:09 am 
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It depends on your tool of choice. I use Python scripts for the download and interpolation. Others use Matlab or whatever.


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PostPosted: Mon Apr 03, 2017 8:36 am 
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Is there any matlab script for downloading and preparing boundary data from HYCOM website in ROMS data bank?


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PostPosted: Tue Apr 04, 2017 9:01 am 
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Location: IR of Iran Meteorological Organization
I changed the LBC to RadNud, but this error apeared:
READ_PHYPAR - could not find input file: ocean_nud.nc

so, can you help me to make this file?


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PostPosted: Tue Apr 04, 2017 12:08 pm 
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Have you downloaded the Matlab tools from the myroms.org site? Look through there.


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PostPosted: Tue Apr 04, 2017 9:45 pm 
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Location: South Australian Research and Development Institute
Here is a link to some somewhat dated Matlab functions - two are for downloading HYCOM reanalysis, one is for preparing a boundary file. Beware that I wrote them in 2013 and I would probably do the boundary file function differently if I did it now (I'm including it as you may find it a useful starting point). It is possible that HYCOM has moved the data to a new machine (url). I ended up not using HYCOM data, but not because of any particular problem with HYCOM. The download required a script because it was to be used in batch mode daily (ie as part of a cron job). You probably don't require that at this stage so could combine the two download functions into a single script or function.
The link: https://1drv.ms/u/s!AvnPG7Gh4JsAgvZQYq04-vFWY-QEPA
Please let me know if and when you download it.
Best of luck.


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PostPosted: Sat Apr 08, 2017 6:03 am 
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thanks for your great help. I used the scripts, but it needs a file named 'latlontopo.mat'. how can I find or produce it?


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PostPosted: Sun Apr 09, 2017 9:50 pm 
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Joined: Mon Jun 20, 2005 3:46 pm
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Location: South Australian Research and Development Institute
My apologies. The link at the end of this contains LatLonTopo.mat (as well as the matlab functions). It is simply a mat-file version of:
http://tds.hycom.org/thredds/dodsC/data ... epth_2d.nc
...which is what HYCOM uses for seafloor topography.

I cannot remember why I created a mat-file when I could have just used the netcdf. You could adapt the Matlab to go straight to the netcdf file. In fact I think I created subset versions of LatLonTopo.mat for different projects and I also can't remember why I did that. Maybe it seemed like a good idea at the time.

-- John

https://1drv.ms/u/s!AvnPG7Gh4JsAgvdeORb6Bq_P0gZ5ZA

Again, please let me know how it goes, in case others need this in future.


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